Mode switching detection method, device, apparatus and storage medium

Abstract

The present application relates to the technical field of heat pump detection, and discloses a mode switching detection method, device, equipment and storage medium, which are used for realizing self-detection of mode switching. The mode switching detection method comprises the following steps: in response to a fault restart instruction, detecting each load based on the fault restart instruction; if each load is in a normal operating state, detecting a first four-way valve; and if the first four-way valve has not switched to a target state, controlling the first four-way valve to switch to the target state.

Description

Technical Field

[0001] This invention relates to the field of heat pump testing technology, and in particular to a method, apparatus, equipment, and storage medium for detecting mode switching. Background Technology

[0002] A tri-generation heat pump unit, or simply a heat pump unit, is an air conditioning and hot water system that uses air as a cold (heat) source to provide heating, cooling, and domestic hot water to an indoor space. The four-way valve is a crucial component of the heat pump unit, allowing it to switch between heating, cooling, and domestic hot water modes to meet diverse user needs.

[0003] However, during the switching between cooling and hot water modes, and because it is necessary to control the operation of two four-way valves in coordination, it is easy for one of the four-way valves to fail to switch due to the small pressure difference between the high and low pressure of the refrigerant. This can lead to the equipment restarting, and the restarted equipment may mistakenly determine that the heat pump unit has completed the switching of the four-way valve. Summary of the Invention

[0004] This invention provides a method, apparatus, device, and storage medium for detecting mode switching, used to achieve self-testing of mode switching.

[0005] The first aspect of the present invention provides a method for detecting mode switching, comprising: responding to a fault restart command, detecting each load based on the fault restart command; if each load is in normal operation, detecting a first four-way valve; if the first four-way valve has not switched to a target state, controlling the first four-way valve to switch to the target state.

[0006] In one feasible implementation, the step of detecting the first four-way valve if all loads are in normal operating condition includes: if all loads are in normal operating condition, obtaining a first pressure value between the first four-way valve and the second four-way valve; obtaining a second pressure value between the second four-way valve and the compressor; calculating a first pressure difference between the first pressure value and the second pressure value; if the first pressure difference is greater than a first threshold, determining that the first four-way valve has not switched to the target state; if the first pressure difference is less than or equal to the first threshold, determining that the first four-way valve has switched to the target state.

[0007] In one feasible implementation, the step of detecting the first four-way valve if all loads are in normal operating condition includes: if all loads are in normal operating condition, obtaining a third pressure value of the first four-way valve under a first preset condition; obtaining a fourth pressure value of the first four-way valve under a second preset condition; calculating a second pressure difference between the third pressure value and the fourth pressure value; if the second pressure difference is less than or equal to a second threshold, determining that the first four-way valve has not switched to the target state; if the second pressure difference is greater than the second threshold, determining that the first four-way valve has switched to the target state.

[0008] In one feasible implementation, the step of detecting the first four-way valve if all loads are in normal operating condition includes: if all loads are in normal operating condition, obtaining the return gas temperature value of the compressor; if the return gas temperature value is greater than a preset return gas temperature value, determining that the first four-way valve has not switched to the target state; if the return gas temperature value is less than or equal to the preset return gas temperature value, determining that the first four-way valve has switched to the target state.

[0009] In one feasible implementation, the step of detecting the first four-way valve if all loads are in normal operating condition includes: if all loads are in normal operating condition, determining whether there is a target control signal corresponding to the first four-way valve; if the target control signal exists, acquiring the return gas pressure value of the compressor; if the return gas pressure value is greater than a preset return gas pressure value, determining that the first four-way valve has not switched to the target state; if the return gas pressure value is less than or equal to the preset return gas pressure value, determining that the first four-way valve has switched to the target state.

[0010] In one feasible implementation, before detecting each load based on the fault restart command in response to the fault restart command, the method further includes: responding to a mode switching command, the mode switching command being used to instruct the heat pump unit to switch from a cooling-to-hot-water mode to a hot-water mode; performing fault shutdown detection on the mode switching process based on the mode switching command; if a fault shutdown state exists during the mode switching process, controlling the heat pump unit to restart when a preset time expires, and generating the fault restart command; when the heat pump unit restarts, controlling the heat pump unit to operate in the cooling-to-hot-water mode, and switching the cooling-to-hot-water mode to the hot-water mode based on the mode switching command.

[0011] In one feasible implementation, the step of controlling the first four-way valve to switch to the target state if the first four-way valve has not switched to the target state includes: if the first four-way valve has not switched to the target state, controlling the compressor to reduce its frequency and energizing the second four-way valve to reduce the compressor's frequency to a target high-low pressure difference, the target high-low pressure difference satisfying the switching condition of the first four-way valve; based on the target high-low pressure difference satisfying the switching condition of the first four-way valve, controlling the first four-way valve to switch to the target state; and responding to the command for the first four-way valve to switch to the target state, controlling the compressor to increase its frequency and de-energizing the second four-way valve.

[0012] A second aspect of the present invention provides a mode switching detection device, comprising: a load detection module, configured to detect each load based on a fault restart command in response to the fault restart command; a four-way valve detection module, configured to detect a first four-way valve if all loads are in normal operating condition; and a control module, configured to control the first four-way valve to switch to the target state if the first four-way valve has not switched to the target state.

[0013] In one feasible implementation, the four-way valve detection module is specifically used for: if all loads are in normal operating condition, obtaining a first pressure value between the first four-way valve and the second four-way valve; obtaining a second pressure value between the second four-way valve and the compressor; calculating a first pressure difference between the first pressure value and the second pressure value; if the first pressure difference is greater than a first threshold, determining that the first four-way valve has not switched to the target state; if the first pressure difference is less than or equal to the first threshold, determining that the first four-way valve has switched to the target state.

[0014] In one feasible implementation, the four-way valve detection module is specifically used for: if all loads are in normal operating condition, obtaining a third pressure value of the first four-way valve under a first preset condition; obtaining a fourth pressure value of the first four-way valve under a second preset condition; calculating a second pressure difference between the third pressure value and the fourth pressure value; if the second pressure difference is less than or equal to a second threshold, determining that the first four-way valve has not switched to the target state; if the second pressure difference is greater than the second threshold, determining that the first four-way valve has switched to the target state.

[0015] In one feasible implementation, the four-way valve detection module is specifically used to: if all loads are in normal operating condition, obtain the return gas temperature value of the compressor; if the return gas temperature value is greater than a preset return gas temperature value, determine that the first four-way valve has not switched to the target state; if the return gas temperature value is less than or equal to the preset return gas temperature value, determine that the first four-way valve has switched to the target state.

[0016] In one feasible implementation, the four-way valve detection module is specifically used for: if all loads are in normal operating condition, determining whether there is a target control signal corresponding to the first four-way valve; if the target control signal exists, acquiring the return gas pressure value of the compressor; if the return gas pressure value is greater than a preset return gas pressure value, determining that the first four-way valve has not switched to the target state; if the return gas pressure value is less than or equal to the preset return gas pressure value, determining that the first four-way valve has switched to the target state.

[0017] In one feasible implementation, the mode switching detection device further includes: a response module, configured to respond to a mode switching command, the mode switching command instructing the heat pump unit to switch from a cooling-to-hot-water mode to a hot-water mode; a shutdown detection module, configured to perform fault shutdown detection on the mode switching process based on the mode switching command; a restart module, configured to control the heat pump unit to restart when a preset time expires if a fault shutdown occurs during the mode switching process, and generate the fault restart command; and an operation module, configured to control the heat pump unit to run the cooling-to-hot-water mode when the heat pump unit restarts, and switch the cooling-to-hot-water mode to the hot-water mode based on the mode switching command.

[0018] In one feasible implementation, the control module is specifically configured to: if the first four-way valve has not switched to the target state, control the compressor to reduce its frequency and energize the second four-way valve to reduce the compressor's frequency to the target high-low pressure difference, wherein the target high-low pressure difference satisfies the switching condition of the first four-way valve; based on the fact that the target high-low pressure difference satisfies the switching condition of the first four-way valve, control the first four-way valve to switch to the target state; and in response to the instruction of the first four-way valve to switch to the target state, control the compressor to increase its frequency and de-energize the second four-way valve.

[0019] A third aspect of the present invention provides a mode switching detection device, comprising: a memory and at least one processor, wherein the memory stores instructions; the at least one processor invokes the instructions in the memory to cause the mode switching detection device to perform the above-described mode switching detection method.

[0020] A fourth aspect of the present invention provides a computer-readable storage medium storing instructions that, when executed on a computer, cause the computer to perform the above-described mode switching detection method.

[0021] In the technical solution provided by this invention, in response to a fault restart command, each load is detected based on the fault restart command; if each load is in normal operating condition, the first four-way valve is detected; if the first four-way valve has not switched to the target state, the first four-way valve is controlled to switch to the target state. In this embodiment of the invention, in response to a fault restart command, each load is detected, and if each load is in normal operating condition, the first four-way valve is detected to see if it has switched to the target state. If the first four-way valve has not switched to the target state, the first four-way valve is controlled to switch to the target state, thus realizing self-checking of mode switching and solving the problem of misjudging that the heat pump unit has completed the four-way valve switching due to equipment restart. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of an embodiment of the mode switching detection method in this invention;

[0023] Figure 2 This is a schematic diagram of another embodiment of the mode switching detection method in this invention;

[0024] Figure 3 This is a schematic diagram of an embodiment of the present invention, showing how to control the first four-way valve to switch to the target state;

[0025] Figure 4 This is a schematic diagram of one embodiment of the cooling-to-hot-water mode in the present invention;

[0026] Figure 5 This is a schematic diagram of one embodiment of the hot water production mode in this invention;

[0027] Figure 6 This is a schematic diagram of one embodiment of the mode switching detection device in this invention;

[0028] Figure 7 This is a schematic diagram of another embodiment of the mode switching detection device in this invention;

[0029] Figure 8 This is a schematic diagram of one embodiment of the mode switching detection device in this invention.

[0030] Explanation of reference numerals in the attached figures:

[0031] 401-Compressor, 402-Gas-Liquid Separator, 403-Second Four-Way Valve, 404-Hot Water Heat Exchanger, 405-First Four-Way Valve, 406-One-Way Valve, 407-Gas-Liquid Separator, 408-One-Way Valve Assembly, 409-Second Electronic Expansion Valve, 410-Finned Heat Exchanger, 411-First Electronic Expansion Valve, 412-Heating Heat Exchanger, 413-Three-Way Valve, 414-Gas-Liquid Separator. Detailed Implementation

[0032] This invention provides a method, apparatus, device, and storage medium for detecting mode switching, used to achieve self-testing of mode switching.

[0033] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” or “having,” and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0034] For ease of understanding, the specific process of the embodiments of the present invention is described below. Please refer to [link / reference]. Figure 1 One embodiment of the mode switching detection method in this invention includes:

[0035] 101. In response to a fault restart command, perform detection on each load based on the fault restart command;

[0036] It is understood that the executing entity of this invention can be a mode switching detection device or a mode switching detection equipment; no specific limitation is made here. This embodiment of the invention will be described using a mode switching detection device as an example.

[0037] A heat pump unit includes at least the following loads: a compressor, a first four-way valve, a second four-way valve, a finned heat exchanger, a first electronic expansion valve, a second electronic expansion valve, a hot water end heat exchanger, a heating end heat exchanger, and a three-way valve. It should be noted that the heat pump unit exchanges heat with the refrigerant through the finned heat exchanger, performs cooling or heating through the heating end heat exchanger, and produces hot water through the hot water end heat exchanger.

[0038] 102. If all loads are in normal operating condition, then test the first four-way valve;

[0039] When the heat pump unit restarts, the mode switching detection device detects each load of the heat pump unit to ensure that each load is in normal operating condition and determines whether the first four-way valve has switched to the target state.

[0040] 103. If the first four-way valve has not switched to the target state, then control the first four-way valve to switch to the target state.

[0041] When the first four-way valve is not switched to the target state, the mode switching detection device controls the compressor to reduce the frequency so that the high and low pressure difference of the first four-way valve meets the switching pressure difference of the first four-way valve, thereby enabling the first four-way valve to switch to the target state.

[0042] In this embodiment of the invention, in response to a fault restart command, each load is detected. When each load is in normal operation, it is detected whether the first four-way valve has switched to the target state. If the first four-way valve has not switched to the target state, it is controlled to switch the first four-way valve to the target state. This realizes the self-test of mode switching and solves the problem of misjudging that the heat pump unit has completed the four-way valve switching due to equipment restart.

[0043] Please see Figure 2 Another embodiment of the mode switching detection method in this invention includes:

[0044] 201. In response to a fault restart command, perform detection on each load based on the fault restart command;

[0045] Specifically, (1) the mode switching detection device responds to the fault restart command and obtains the operating data and load component temperature data corresponding to each load based on the fault restart command; (2) if the operating data corresponding to each load conforms to the corresponding preset normal operating data, and the load component temperature data corresponding to each load conforms to the corresponding preset component temperature data, then the mode switching detection device determines that each load is in normal operating condition.

[0046] A heat pump unit includes at least the following loads: compressor, first four-way valve, second four-way valve, finned heat exchanger, first electronic expansion valve, second electronic expansion valve, hot water end heat exchanger, heating end heat exchanger, and three-way valve.

[0047] For example, the preset normal operating data of the compressor includes, but is not limited to: (1) the compressor discharge pressure is greater than or equal to 1.1 MPa and less than or equal to 1.5 MPa, and the specific pressure value can be set according to the actual application scenario; (2) the compressor operating current is less than or equal to the rated current value. The preset component temperature data of the compressor is: the temperature value is greater than or equal to 45 degrees and less than or equal to 90 degrees, and the specific temperature value can be set according to the actual application scenario. The preset normal operating data of the first four-way valve includes, but is not limited to: (1) the coil is energized; (2) the operating voltage value is less than or equal to the rated voltage value. The preset component temperature data of the first four-way valve is: the temperature value is less than or equal to 120 degrees, and the specific temperature value can be set according to the actual application scenario. The preset normal operating data of the second four-way valve includes, but is not limited to: (1) the coil is energized; (2) the operating voltage value is less than or equal to the rated voltage value. The preset component temperature data of the first four-way valve is: the temperature value is less than or equal to 120 degrees, and the specific temperature value can be set according to the actual application scenario. The preset normal operating data of the finned heat exchanger includes, but is not limited to: (1) the operating current value is less than or equal to the rated current value; (2) the operating voltage value is less than or equal to the rated voltage value. The preset component temperature data of the finned heat exchanger is: the temperature value is greater than or equal to 30 degrees and less than or equal to 45 degrees. The specific temperature value can be set according to the actual application scenario. The preset normal operating data of the first electronic expansion valve includes, but is not limited to: (1) the coil is energized; (2) the operating voltage value is less than or equal to the rated voltage value. The preset component temperature data of the first electronic expansion valve is: the temperature value is less than or equal to 110 degrees. The specific temperature value can be set according to the actual application scenario. The preset normal operating data of the second electronic expansion valve includes, but is not limited to: (1) the coil is energized; (2) the operating voltage value is less than or equal to the rated voltage value. The preset component temperature data of the first electronic expansion valve is: the temperature value is less than or equal to 110 degrees. The specific temperature value can be set according to the actual application scenario. The preset normal operating data of the hot water end heat exchanger includes, but is not limited to: (1) energized; (2) the outlet water temperature is equal to the set temperature value. The preset component temperature data for the hot water heat exchanger is: the temperature value is less than or equal to 100 degrees Celsius. The specific temperature value can be set according to the actual application scenario. The preset normal operation data for the heating heat exchanger includes, but is not limited to: (1) being in the energized state; (2) the output temperature is equal to the set temperature value. The preset component temperature data for the heating heat exchanger is: the temperature value is less than or equal to 50 degrees Celsius. The specific temperature value can be set according to the actual application scenario. The preset normal operation data for the three-way valve includes, but is not limited to: (1) being in the energized state; (2) the operating voltage value is less than or equal to the rated voltage value; (3) the operating current value is less than or equal to the rated current value.The preset component temperature data for the three-way valve is: the temperature value is less than or equal to 60 degrees Celsius. The specific temperature value can be set according to the actual application scenario.

[0048] For example, the mode switching detection device responds to a fault restart command and obtains the compressor's operating data and load component temperature data based on the fault restart command. If the compressor's discharge pressure is greater than or equal to 1.1 MPa and less than or equal to 1.5 MPa, the operating current is less than or equal to the rated current, and the temperature is greater than or equal to 45 degrees and less than or equal to 90 degrees, then the mode switching detection device determines that the compressor is in normal operating condition.

[0049] 202. If all loads are in normal operating condition, then test the first four-way valve;

[0050] It is understandable that by setting pressure sensors on the first four-way valve and the second four-way valve, the first pressure value between the first four-way valve and the second four-way valve can be obtained in real time. By also setting a pressure sensor between the second four-way valve and the compressor, the second pressure value between the second four-way valve and the compressor can be obtained in real time.

[0051] Specifically, (1) if all loads are in normal operating condition, the mode switching detection device obtains the first pressure value between the first four-way valve and the second four-way valve; (2) the mode switching detection device obtains the second pressure value between the second four-way valve and the compressor; (3) the mode switching detection device calculates the first pressure difference between the first pressure value and the second pressure value; (4) if the first pressure difference is greater than the first threshold, the mode switching detection device determines that the first four-way valve has not switched to the target state; (5) if the first pressure difference is less than or equal to the first threshold, the mode switching detection device determines that the first four-way valve has switched to the target state.

[0052] For example, if all loads are in normal operation, the mode switching detection device acquires the first pressure value P1 between the first four-way valve and the second four-way valve, acquires the second pressure value P2 between the second four-way valve and the compressor, and calculates the first pressure difference between P1 and P2. If the first pressure difference is greater than the first threshold, the mode switching detection device determines that the first four-way valve has not switched to the target state. If the first pressure difference is less than or equal to the first threshold, the mode switching detection device determines that the first four-way valve has switched to the target state.

[0053] 203. If the first four-way valve does not switch to the target state, control the compressor to reduce its frequency and energize the second four-way valve to reduce the compressor frequency to the target high and low pressure difference, which satisfies the switching condition of the first four-way valve.

[0054] The switching condition for the first four-way valve refers to the minimum switching pressure difference that allows the valve to switch smoothly, which must be greater than or equal to the high-low pressure difference. The magnitude of the high-low pressure difference is positively correlated with the compressor's operating frequency; the higher the frequency, the larger the pressure difference, and the longer the balancing time required for high and low pressure equilibrium. However, an excessively large pressure difference will impact the valve body of the first four-way valve, increasing the risk of hardware damage. Therefore, it is necessary to reduce the compressor frequency to achieve the switching of the first four-way valve, and ensure that the high-low pressure difference is above the minimum switching pressure difference recommended in the valve's specifications, for example, above 0.3 MPa.

[0055] For example, such as Figure 3 As shown, when switching from cooling to hot water mode, if the first four-way valve does not switch to the target state, the compressor frequency is reduced to 40 Hz (or any other frequency, which is not limited here). The second four-way valve is then energized. At the end of time T1, the first four-way valve is energized again to reduce the compressor frequency to the target high-low pressure difference, which satisfies the switching condition of the first four-way valve. Alternatively, when switching from hot water mode to cooling to hot water mode, if the first four-way valve does not switch to the target state, the compressor frequency is reduced to 40 Hz (or any other frequency, which is not limited here). The second four-way valve is energized. At the end of time t1, the first four-way valve is de-energized to reduce the compressor frequency to the target high-low pressure difference, which satisfies the switching condition of the first four-way valve.

[0056] 204. Based on the target high and low pressure difference satisfying the switching conditions of the first four-way valve, control the first four-way valve to switch to the target state;

[0057] For example, if the target high-low pressure difference is greater than or equal to the minimum switching pressure difference, the mode switching detection device controls the first four-way valve to switch to the target state, such as... Figure 3 As shown, the first four-way valve is in the target state during time T2.

[0058] It should be noted that, in Figure 3 In the given information, T1 = t1, T2 = t2.

[0059] 205. In response to the command to switch the first four-way valve to the target state, control the compressor to operate at increased frequency and de-energize the second four-way valve.

[0060] After the first four-way valve switches to the target state, the compressor's operating frequency is restored. It is not necessary to wait for the compressor frequency to slowly drop to the minimum or stop before switching the four-way valve. Instead, the minimum switching pressure difference is met by the high and low pressure difference, so that the first four-way valve switches to the target state. This ensures the normal operation of the heat pump unit, helps to improve the stability of the heat pump unit, and reduces the possibility of heat pump failure.

[0061] In one feasible implementation, (1) if each load is in normal operation, the mode switching detection device acquires the third pressure value of the first four-way valve under the first preset condition; (2) the mode switching detection device acquires the fourth pressure value of the first four-way valve under the second preset condition; (3) the mode switching detection device calculates the second pressure difference between the third pressure value and the fourth pressure value; (4) if the second pressure difference is less than or equal to the second threshold, the mode switching detection device determines that the first four-way valve has not switched to the target state; (5) if the second pressure difference is greater than the second threshold, the mode switching detection device determines that the first four-way valve has switched to the target state.

[0062] The first preset condition refers to either the cooling-to-hot-water mode or the hot-water mode of the heat pump unit. It should be noted that the cooling-to-hot-water mode refers to a dual-mode operation, meaning it can simultaneously perform both cooling and hot water production. The second preset condition refers to the situation where the first four-way valve switches to the target state or the equipment mistakenly interprets the first four-way valve in the heat pump unit as having switched to the target state after a restart. For example, switching from cooling-to-hot-water mode to hot-water mode, where the first four-way valve switches to the target state; or switching from hot-water mode to cooling-to-hot-water mode, where the first four-way valve switches to the target state.

[0063] For example, such as Figure 4As shown, the heat pump unit is in cooling / hot water production mode. Specifically, the high-temperature, high-pressure refrigerant compressed by the compressor 401 enters the second four-way valve 403 through the gas-liquid separator 402. At this time, the second four-way valve 403 is in a de-energized state, that is, ports D and C of the second four-way valve 403 are interconnected. The high-temperature, high-pressure refrigerant enters from port D of the second four-way valve 403 and exits from port C of the second four-way valve 403. The high-temperature, high-pressure refrigerant then enters the hot water heat exchanger 404 through the second four-way valve 403 to produce hot water, resulting in liquid refrigerant. Since the first four-way valve 405 is also in a de-energized state at this time, that is, ports D and C of the first four-way valve 405 are interconnected, and ports E and S of the first four-way valve 405 are interconnected, the pressure at port E of the first four-way valve 405... The pressure value is lower than that at port C of the first four-way valve 405. Therefore, the liquid refrigerant cannot pass through the one-way valve 406, gas-liquid separator 407, one-way valve assembly 408, second electronic expansion valve 409, and finned heat exchanger 410 to enter port C of the first four-way valve 405. So the liquid refrigerant can only pass through the one-way valve 406, gas-liquid separator 407, and one-way valve assembly 408, and then be throttled by the first electronic expansion valve 411. The throttled liquid refrigerant enters the heating end heat exchanger 412 for cooling, resulting in low-temperature gaseous refrigerant. The low-temperature gaseous refrigerant from the heating end heat exchanger 412 enters through port E of the first four-way valve 405, exits through port S of the first four-way valve 405, and returns to the compressor through the three-way valve 413 and gas-liquid separator 414.

[0064] For example, such as Figure 5 As shown, the heat pump unit is in hot water production mode. Specifically, the high-temperature, high-pressure refrigerant compressed by the compressor 401 enters the second four-way valve 403 through the gas-liquid separator 402. At this time, the second four-way valve 403 is in a de-energized state, that is, ports D and C of the second four-way valve 403 are interconnected. The high-temperature, high-pressure refrigerant enters from port D of the second four-way valve 403 and exits from port C of the second four-way valve 403. The high-temperature, high-pressure refrigerant then enters the hot water heat exchanger 404 through the second four-way valve 403 to produce hot water, resulting in liquid refrigerant. Since the first four-way valve 405 is in an energized state at this time, that is, the first four-way valve 405... The S and C ports of the first four-way valve 405 are interconnected, and the E and D ports of the first four-way valve 405 are interconnected. Since the pressure value of the C port of the first four-way valve 405 is lower than the pressure value of the E port of the first four-way valve 405, the liquid refrigerant can pass through the one-way valve 406, the gas-liquid separator 407 and the one-way valve assembly 408, and then be throttled through the second electronic expansion valve 409. The throttled liquid refrigerant enters the finned heat exchanger 410, exchanges heat through the finned heat exchanger 410, and then enters from the C port of the first four-way valve 405 and exits from the S port of the first four-way valve 405. It then returns to the compressor through the three-way valve 413 and the gas-liquid separator 414.

[0065] For example, if all loads are in normal operation, the mode switching detection device obtains the third pressure value P3 of the first four-way valve under the first preset condition, and the mode switching detection device obtains the fourth pressure value P4 of the first four-way valve under the second preset condition. The mode switching detection device calculates the second pressure difference between P3 and P4. If the second pressure difference is less than or equal to the second threshold, the mode switching detection device determines that the first four-way valve has not switched to the target state. If the second pressure difference is greater than the second threshold, the mode switching detection device determines that the first four-way valve has switched to the target state.

[0066] In one feasible implementation, (1) if each load is in normal operation, the mode switching detection device obtains the return gas temperature value of the compressor; (2) if the return gas temperature value is greater than the preset return gas temperature value, the mode switching detection device determines that the first four-way valve has not switched to the target state; (3) if the return gas temperature value is less than or equal to the preset return gas temperature value, the mode switching detection device determines that the first four-way valve has switched to the target state.

[0067] The return gas temperature value refers to the temperature value of the low-temperature gaseous refrigerant coming out of the heat exchanger at the heating end.

[0068] For example, if all loads are operating normally, the mode switching detection device obtains the compressor's return gas temperature value: 50 degrees Celsius. If the preset return gas temperature value is 40 degrees Celsius, then the return gas temperature value is greater than the preset return gas temperature value, and the mode switching detection device determines that the first four-way valve has not switched to the target state. Alternatively, if all loads are operating normally, the mode switching detection device obtains the compressor's return gas temperature value: 30 degrees Celsius. If the preset return gas temperature value is 40 degrees Celsius, then the return gas temperature value is less than the preset return gas temperature value, and the mode switching detection device determines that the first four-way valve has switched to the target state.

[0069] In one feasible implementation, (1) if each load is in normal operation, the mode switching detection device determines whether there is a target control signal corresponding to the first four-way valve; (2) if there is a target control signal, the mode switching detection device obtains the return gas pressure value of the compressor; (3) if the return gas pressure value is greater than the preset return gas pressure value, the mode switching detection device determines that the first four-way valve has not switched to the target state; (4) if the return gas pressure value is less than or equal to the preset return gas pressure value, the mode switching detection device determines that the first four-way valve has switched to the target state.

[0070] The return gas pressure value refers to the pressure value of the low-temperature gaseous refrigerant coming out of the heat exchanger at the heating end.

[0071] For example, if all loads are in normal operation, the mode switching detection device determines whether a target control signal corresponding to the first four-way valve exists. If a target control signal exists, the mode switching detection device obtains the compressor's return gas pressure value. If the return gas pressure value is 0.4 MPa and the preset return gas pressure value is 0.3 MPa, then the return gas pressure value is greater than the preset return gas pressure value, and the mode switching detection device determines that the first four-way valve has not switched to the target state. Alternatively, if the return gas pressure value is 0.25 MPa and the preset return gas pressure value is 0.3 MPa, then the return gas pressure value is less than the preset return gas pressure value, and the mode switching detection device determines that the first four-way valve has switched to the target state.

[0072] In one feasible implementation, (1) if all loads are in normal operation, the mode switching detection device acquires the fifth pressure value of the second four-way valve under the first preset condition; (2) the mode switching detection device acquires the sixth pressure value of the second four-way valve under the second preset condition; (3) the mode switching detection device calculates the third pressure difference between the fifth pressure value and the sixth pressure value; (4) if the third pressure difference is less than or equal to the third threshold, the mode switching detection device determines that the first four-way valve has not switched to the target state; (5) if the third pressure difference is greater than the third threshold, the mode switching detection device determines that the first four-way valve has switched to the target state.

[0073] For example, if all loads are in normal operation, the mode switching detection device acquires the fifth pressure value P5 of the second four-way valve under the first preset condition, the mode switching detection device acquires the sixth pressure value P6 of the second four-way valve under the second preset condition, and the mode switching detection device calculates the third pressure difference between P5 and P6. If the third pressure difference is less than or equal to the third threshold, the mode switching detection device determines that the first four-way valve has not switched to the target state. If the third pressure difference is greater than the third threshold, the mode switching detection device determines that the first four-way valve has switched to the target state.

[0074] In one feasible implementation, before detecting each load based on the fault restart command in response to the fault restart command, the method further includes: (1) a mode switching detection device responding to the mode switching command, the mode switching command being used to instruct the heat pump unit to switch from a cooling-to-hot water mode to a hot water mode; (2) the mode switching detection device performing fault shutdown detection on the mode switching process based on the mode switching command; (3) if a fault shutdown state exists during the mode switching process, the mode switching detection device controls the heat pump unit to restart when the preset time expires, and generates a fault restart command; (4) when the heat pump unit restarts, the mode switching detection device controls the heat pump unit to run in a cooling-to-hot water mode, and switches the cooling-to-hot water mode to a hot water mode based on the mode switching command.

[0075] It should be noted that the preset duration includes the valve cutting time and the stabilization time. The preset duration can be set according to the actual application scenario, and there is no limitation here. For example, the preset duration is 40 seconds, which includes 30 seconds of valve cutting time and 10 seconds of stabilization time.

[0076] For example, the mode switching detection device responds to the mode switching command, which instructs the heat pump unit to switch from cooling to hot water mode to hot water mode. Based on the mode switching command, the mode switching detection device performs fault shutdown detection during the mode switching process. If a fault shutdown occurs during the mode switching process, with a preset duration of 40 seconds, the mode switching detection device controls the heat pump unit to restart after 40 seconds and generates a fault restart command. When the heat pump unit restarts, the mode switching detection device controls the heat pump unit to run in cooling to hot water mode and switches from cooling to hot water mode to hot water mode based on the mode switching command.

[0077] In one feasible implementation, before detecting each load based on the fault restart command in response to the fault restart command, the method further includes: (1) a mode switching detection device responding to the mode switching command, the mode switching command being used to instruct the heat pump unit to switch from hot water production mode to cooling hot water production mode; (2) the mode switching detection device performing fault shutdown detection on the mode switching process based on the mode switching command; (3) if there is a fault shutdown state during the mode switching process, the mode switching detection device controls the heat pump unit to restart when the preset time ends, and generates a fault restart command; (4) when the heat pump unit restarts, the mode switching detection device controls the heat pump unit to run in hot water production mode, and switches the hot water production mode to cooling hot water production mode based on the mode switching command.

[0078] For example, the mode switching detection device responds to a mode switching command, which instructs the heat pump unit to switch from hot water production mode to cooling hot water production mode. Based on the mode switching command, the mode switching detection device performs fault shutdown detection during the mode switching process. If a fault shutdown occurs during the mode switching process, with a preset duration of 40 seconds, the mode switching detection device controls the heat pump unit to restart after 40 seconds and generates a fault restart command. When the heat pump unit restarts, the mode switching detection device controls the heat pump unit to run in hot water production mode and switches the hot water production mode to cooling hot water production mode based on the mode switching command.

[0079] In this embodiment of the invention, in response to a fault restart command, each load is detected. When each load is in normal operation, it is detected whether the first four-way valve has switched to the target state. If the first four-way valve has not switched to the target state, it is controlled to switch the first four-way valve to the target state. This realizes the self-test of mode switching and solves the problem of misjudging that the heat pump unit has completed the four-way valve switching due to equipment restart.

[0080] The method for detecting mode switching in the embodiments of the present invention has been described above. The detection device for mode switching in the embodiments of the present invention will be described below. Please refer to [link / reference]. Figure 6 One embodiment of the mode switching detection device in this invention includes:

[0081] The load detection module 601 is used to detect each load in response to a fault restart command.

[0082] The four-way valve detection module 602 is used to detect the first four-way valve if all loads are in normal operating condition.

[0083] The control module 603 is used to control the first four-way valve to switch to the target state if the first four-way valve has not switched to the target state.

[0084] In this embodiment of the invention, in response to a fault restart command, each load is detected. When each load is in normal operation, it is detected whether the first four-way valve has switched to the target state. If the first four-way valve has not switched to the target state, it is controlled to switch the first four-way valve to the target state. This realizes the self-test of mode switching and solves the problem of misjudging that the heat pump unit has completed the four-way valve switching due to equipment restart.

[0085] Please see Figure 7 Another embodiment of the mode switching detection device in this invention includes:

[0086] The load detection module 601 is used to detect each load in response to a fault restart command.

[0087] The four-way valve detection module 602 is used to detect the first four-way valve if all loads are in normal operating condition.

[0088] The control module 603 is used to control the first four-way valve to switch to the target state if the first four-way valve has not switched to the target state.

[0089] Optionally, the four-way valve detection module 602 is specifically used for:

[0090] If all loads are in normal operating condition, obtain the first pressure value between the first four-way valve and the second four-way valve;

[0091] Obtain the second pressure value between the second four-way valve and the compressor;

[0092] Calculate the first pressure difference between the first pressure value and the second pressure value;

[0093] If the first pressure difference is greater than the first threshold, it is determined that the first four-way valve has not switched to the target state;

[0094] If the first pressure difference is less than or equal to the first threshold, then it is determined that the first four-way valve has switched to the target state.

[0095] Optionally, the four-way valve detection module 602 is specifically used for:

[0096] If all loads are in normal operating condition, then obtain the third pressure value of the first four-way valve under the first preset condition;

[0097] Obtain the fourth pressure value of the first four-way valve under the second preset condition;

[0098] Calculate the second pressure difference between the third and fourth pressure values;

[0099] If the second pressure difference is less than or equal to the second threshold, it is determined that the first four-way valve has not switched to the target state;

[0100] If the second pressure difference is greater than the second threshold, it is determined that the first four-way valve has switched to the target state.

[0101] Optionally, the four-way valve detection module 602 is specifically used for:

[0102] If all loads are in normal operating condition, obtain the return gas temperature value of the compressor;

[0103] If the return gas temperature is greater than the preset return gas temperature, it is determined that the first four-way valve has not switched to the target state.

[0104] If the return gas temperature is less than or equal to the preset return gas temperature, then the first four-way valve has been switched to the target state.

[0105] Optionally, the four-way valve detection module 602 is specifically used for:

[0106] If all loads are in normal operating condition, then determine whether there is a target control signal corresponding to the first four-way valve;

[0107] If a target control signal exists, obtain the compressor's return gas pressure value;

[0108] If the return air pressure value is greater than the preset return air pressure value, it is determined that the first four-way valve has not switched to the target state;

[0109] If the return air pressure value is less than or equal to the preset return air pressure value, it is determined that the first four-way valve has switched to the target state.

[0110] Optionally, the mode switching detection device also includes:

[0111] The response module 604 is used to respond to the mode switching command, which instructs the heat pump unit to switch from the cooling-to-hot-water mode to the hot-water mode.

[0112] The shutdown detection module 605 is used to perform fault shutdown detection during the mode switching process based on the mode switching command;

[0113] The restart module 606 is used to control the heat pump unit to restart when the preset time expires if there is a fault shutdown state during the mode switching process, and to generate a fault restart command.

[0114] The operation module 607 is used to control the heat pump unit to run in cooling and hot water mode when the heat pump unit restarts, and to switch the cooling and hot water mode to hot water mode based on the mode switching command.

[0115] Optionally, the control module 603 is specifically used for:

[0116] If the first four-way valve does not switch to the target state, the compressor is controlled to reduce its frequency, and the second four-way valve is energized to reduce the compressor frequency to the target high and low pressure difference, which satisfies the switching condition of the first four-way valve.

[0117] Based on the target high and low pressure difference satisfying the switching conditions of the first four-way valve, control the first four-way valve to switch to the target state;

[0118] In response to the command to switch the first four-way valve to the target state, the compressor is controlled to operate at a higher frequency, and the second four-way valve is de-energized.

[0119] In this embodiment of the invention, in response to a fault restart command, each load is detected. When each load is in normal operation, it is detected whether the first four-way valve has switched to the target state. If the first four-way valve has not switched to the target state, it is controlled to switch the first four-way valve to the target state. This realizes the self-test of mode switching and solves the problem of misjudging that the heat pump unit has completed the four-way valve switching due to equipment restart.

[0120] above Figure 6 and Figure 7 The mode switching detection device in the embodiments of the present invention will be described in detail from the perspective of modular functional entities. The mode switching detection device in the embodiments of the present invention will be described in detail from the perspective of hardware processing.

[0121] Figure 8This is a schematic diagram of a mode switching detection device 800 provided in an embodiment of the present invention. The mode switching detection device 800 can vary significantly due to different configurations or performance characteristics. It may include one or more central processing units (CPUs) 810 (e.g., one or more processors) and a memory 820, and one or more storage media 830 (e.g., one or more mass storage devices) storing application programs 833 or data 832. The memory 820 and storage media 830 can be temporary or persistent storage. The program stored in the storage media 830 may include one or more modules (not shown in the diagram), each module including a series of instruction operations on the mode switching detection device 800. Furthermore, the processor 810 may be configured to communicate with the storage media 830 and execute the series of instruction operations in the storage media 830 on the mode switching detection device 800.

[0122] The mode switching detection device 800 may also include one or more power supplies 840, one or more wired or wireless network interfaces 850, one or more input / output interfaces 860, and / or one or more operating systems 831, such as Windows Server, Mac OS X, Unix, Linux, FreeBSD, etc. Those skilled in the art will understand that... Figure 8 The illustrated mode switching detection device structure does not constitute a limitation on the mode switching detection device, and may include more or fewer components than illustrated, or combine certain components, or have different component arrangements.

[0123] The present invention also provides a mode switching detection device, which includes a memory and a processor. The memory stores computer-readable instructions. When the computer-readable instructions are executed by the processor, the processor performs the steps of the mode switching detection method in the above embodiments.

[0124] The present invention also provides a computer-readable storage medium, which may be a non-volatile computer-readable storage medium or a volatile computer-readable storage medium, wherein the computer-readable storage medium stores instructions that, when the instructions are executed on a computer, cause the computer to perform the steps of the mode switching detection method.

[0125] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0126] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0127] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for detecting mode switching, characterized in that, This invention is applied to heat pump units, which at least include a gas-liquid separator, a hot water heat exchanger, a heating heat exchanger, a first four-way valve, a second four-way valve, a compressor, and a finned heat exchanger. The output end of the compressor is connected to the input end of the gas-liquid separator. The output end of the gas-liquid separator is connected to port D of the second four-way valve. Port C of the second four-way valve is connected to the hot water heat exchanger. Port E of the second four-way valve is connected to port D of the first four-way valve. Port E of the first four-way valve is connected to the heating heat exchanger. Port S of the first four-way valve is indirectly connected to the gas-liquid separator. Port C of the first four-way valve is connected to the finned heat exchanger. The detection method for mode switching includes: In response to a mode switching command, the mode switching command is used to instruct the heat pump unit to switch from a cooling-to-hot-water mode to a hot-water mode; Based on the mode switching command, fault shutdown detection is performed during the mode switching process; If a fault shutdown occurs during the mode switching process, the heat pump unit will be restarted when the preset time expires, and a fault restart command will be generated. When the heat pump unit restarts, it controls the heat pump unit to run the cooling and hot water production mode, and switches the cooling and hot water production mode to the hot water production mode based on the mode switching command; In response to a fault restart command, each load is detected based on the fault restart command; If all the loads are in normal operating condition, then the first four-way valve is tested; If the first four-way valve is not switched to the target state, then the first four-way valve is controlled to switch to the target state; wherein, the target state is the interconnected state of ports D and C, and ports E and S in the first four-way valve when the heat pump unit is in the cooling and hot water production mode, or the interconnected state of ports S and C, and ports E and D in the first four-way valve when the heat pump unit is in the hot water production mode.

2. The mode switching detection method according to claim 1, characterized in that, If all the loads are in normal operating condition, the first four-way valve is tested, including: If all the loads are in normal operating condition, then obtain the first pressure value between the first four-way valve and the second four-way valve; Obtain the second pressure value between the second four-way valve and the compressor; Calculate the first pressure difference between the first pressure value and the second pressure value; If the first pressure difference is greater than the first threshold, it is determined that the first four-way valve has not switched to the target state; If the first pressure difference is less than or equal to the first threshold, then it is determined that the first four-way valve has switched to the target state.

3. The mode switching detection method according to claim 1, characterized in that, If all the loads are in normal operating condition, the first four-way valve is tested, including: If all the loads are in normal operation, then the third pressure value of the first four-way valve under the first preset condition is obtained; the first preset condition refers to the cooling and hot water production mode or the hot water production mode of the heat pump unit. Obtain the fourth pressure value of the first four-way valve under the second preset condition; the second preset condition refers to the first four-way valve switching to the target state or the equipment misjudging that the first four-way valve in the heat pump unit has switched to the target state after restarting. Calculate the second pressure difference between the third pressure value and the fourth pressure value; If the second pressure difference is less than or equal to the second threshold, it is determined that the first four-way valve has not switched to the target state; If the second pressure difference is greater than the second threshold, then it is determined that the first four-way valve has switched to the target state.

4. The mode switching detection method according to claim 1, characterized in that, If all the loads are in normal operating condition, the first four-way valve is tested, including: If all the loads are in normal operating condition, then obtain the return gas temperature value of the compressor; If the return gas temperature value is greater than the preset return gas temperature value, it is determined that the first four-way valve has not switched to the target state; If the return gas temperature value is less than or equal to the preset return gas temperature value, then it is determined that the first four-way valve has switched to the target state.

5. The mode switching detection method according to claim 1, characterized in that, If all the loads are in normal operating condition, the first four-way valve is tested, including: If all the loads are in normal operating condition, then determine whether there is a target control signal corresponding to the first four-way valve; If the target control signal exists, the return gas pressure value of the compressor is obtained; If the return gas pressure value is greater than the preset return gas pressure value, it is determined that the first four-way valve has not switched to the target state; If the return air pressure value is less than or equal to the preset return air pressure value, then it is determined that the first four-way valve has switched to the target state.

6. The mode switching detection method according to claim 1, characterized in that, The step of controlling the first four-way valve to switch to the target state if the first four-way valve has not switched to the target state includes: If the first four-way valve does not switch to the target state, the compressor is controlled to reduce its frequency, and the second four-way valve is energized to reduce the compressor's frequency to the target high-low pressure difference, which satisfies the switching condition of the first four-way valve. Based on the target high and low pressure difference satisfying the switching conditions of the first four-way valve, the first four-way valve is controlled to switch to the target state; In response to the instruction that the first four-way valve switches to the target state, the compressor is controlled to operate at increased frequency, and the second four-way valve is de-energized.

7. A mode switching detection device, characterized in that, This invention is applied to heat pump units, which at least include a gas-liquid separator, a hot water heat exchanger, a heating heat exchanger, a first four-way valve, a second four-way valve, a compressor, and a finned heat exchanger. The output end of the compressor is connected to the input end of the gas-liquid separator. The output end of the gas-liquid separator is connected to port D of the second four-way valve. Port C of the second four-way valve is connected to the hot water heat exchanger. Port E of the second four-way valve is connected to port D of the first four-way valve. Port E of the first four-way valve is connected to the heating heat exchanger. Port S of the first four-way valve is indirectly connected to the gas-liquid separator. Port C of the first four-way valve is connected to the finned heat exchanger. The mode switching detection device includes: The system includes a response module for responding to a mode switching command, which instructs the heat pump unit to switch from a cooling-to-hot water mode to a hot water mode; a shutdown detection module for detecting a fault shutdown during the mode switching process based on the mode switching command; a restart module for controlling the heat pump unit to restart when a preset time expires if a fault shutdown occurs during the mode switching process, and generating a fault restart command; and an operation module for controlling the heat pump unit to run in the cooling-to-hot water mode when the heat pump unit restarts, and switching the cooling-to-hot water mode back to the hot water mode based on the mode switching command. The load detection module is used to detect each load in response to a fault restart command. The four-way valve detection module is used to detect the first four-way valve if all the loads are in normal operating condition. The control module is configured to control the first four-way valve to switch to the target state if the first four-way valve has not switched to the target state; wherein the target state is the interconnected state of ports D and C, and ports E and S of the first four-way valve when the heat pump unit is in the cooling and hot water production mode, or the interconnected state of ports S and C, and ports E and D of the first four-way valve when the heat pump unit is in the hot water production mode.

8. A detection device for mode switching, characterized in that, The mode switching detection device includes: a memory and at least one processor, wherein the memory stores instructions; The at least one processor invokes the instructions in the memory to cause the mode switching detection device to perform the mode switching detection method as described in any one of claims 1-6.

9. A computer-readable storage medium storing instructions thereon, characterized in that, When the instruction is executed by the processor, it implements the mode switching detection method as described in any one of claims 1-6.

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